Monthly Archives: November 2010

Creating a kernel with only the drivers used by your computer

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If you want to create a kernel with only the driver for your system then use the diet-kconfig:

http://mirror.leaseweb.com/kernel/people/tiwai/misc/diet-kconfig

Entre no diretorio fonte do kernel que voce deseja compilar e execute:
$ ./diet-kconfig -a i686

Apos escolher as opcoes basicas, compile normalmente:
$ make
$ sudo make install

Dica: se voce deseja converter todos os modulos dos drivers em built-in, entao edite a funcao kconfig_mod do diet-kconfig substituindo o ‘$1′=m/’ por ‘$1′=y/’ .

Interpreting NMEA data

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If you are debugging GPS data, then GPGGA is the most important data to get Lat/Long position. Example:

$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47

Where:
     GGA          Global Positioning System Fix Data
     123519       Fix taken at 12:35:19 UTC
     4807.038,N   Latitude 48 deg 07.038' N
     01131.000,E  Longitude 11 deg 31.000' E
     1            Fix quality: 0 = invalid
                               1 = GPS fix (SPS)
                               2 = DGPS fix
                               3 = PPS fix
			       4 = Real Time Kinematic
			       5 = Float RTK
                               6 = estimated (dead reckoning) (2.3 feature)
			       7 = Manual input mode
			       8 = Simulation mode
     08           Number of satellites being tracked
     0.9          Horizontal dilution of position
     545.4,M      Altitude, Meters, above mean sea level
     46.9,M       Height of geoid (mean sea level) above WGS84
                      ellipsoid
     (empty field) time in seconds since last DGPS update
     (empty field) DGPS station ID number
     *47          the checksum data, always begins with *

Source: http://gpsinformation.org/dale/nmea.htm

Criando memoria RAM com transistor

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Como voces devem ter percebido o bicho esta’ pegando pro meu lado, nao tive tempo de publicar absolutamente nada nao ultima semana.

Mas vamos la’, o importante e’ nao deixar a peteca cair e sempre procurar algo interessante para publicar.

Achei no Instructables uma dica de como construir um memoria RAM (SRAM = flip-flop) usando transistores MOSFET:
http://www.instructables.com/id/DIY-CMOS-RAM-Memory/